Antifriction-jack



A. W. MARR.

ANTIFRICTION JACK.

APPLICATION FILED JUNE 18, 1919.

Patented Nov. 30, 1920.

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um "tom tubular UNITED TES PATENT OFFICE.

'ALEXANDER W. MARE, 0F CANTON, OHIO.

ANTIFRIGTION-J'ACK.

To all whom it may concern.

Be it known that I, ALEXANDER W. MARK,-

a citizen of the United States, residing at Canton, in the county of Starkand State of Ohio, have invented certain new and useful Improvements in Antifriction J asks, of which the following is a specification.

This invention relates to new and useful improvements in anti-friction jacks.

One of the principal objects of my invention is to provide a jack in which neither the screw will drop down, nor the bearings fall out, when the jack is turned upside down, or held or placed in any other position. In my improved ack the ball bearings are not only kept in place at all times, but there is no danger of the hands being pinched by a falling screw, since the latter cannot drop down or be pulled out. However, the ack is a quick action one, in that the ratchet may be turned free of the pawl, quickly to lift and lower the screw.

Another object of my invention is to provide ajack whose principal parts may be constructed by the punch press and spot welded together. By this method the jack may be cheaply constructed without sacrificing its efliciency, The jack is admirably adapted for automobile use, being quick in action, durable and simple in construction, and reasonable in price.

Other important and incidental objects will be brought out in the following specification and particularly set forth in the subjoined claims.

One form of embodiment of my invention is illustrated in the accompanying drawings, of which Figure 1 is a vertical sectional view of my improvedrjack. Fig. 2 is a transverse section taken through the lower portion of the standard to show the vertical screw and transverse guide pin. Fig. 3 is atop plan view ofthe laminated pawl and ratchet, showing the keys for preventing the screw from dropping down. Fig.4 is a vertical section of the upper portion of the standard and laminated ratchet wheel, showing said keys. Fig. 5 isa vertical sectional view through the laminated pawl. Fig. 6 is a plan viewof theform of top and low section of said pawl. AndFig. 7 is a plan view of the middle section of the latter. V

Throughout the specification and drawings, similar referencecharacters denote corresponding parts.

Specification of Letters Patent. Pate t d N 30 1920 Application filed June 18, 1919.

Serial No. 305,002.

Referring to the accompanying drawings, the numeral 1 designates the base and 2 the receiving socket secured thereto, for a tubular standard 3. As shown in Fig. 2, this standard is preferably constructedwith t'wo oppositely disposed longitudinal rib .portions t that are grooved to receive the ends of a transverse pin 5 that hasa driving fit in a vertical screw 6 which has an up and down movement within the tubular standard 3. When the jack is being constructed,

its top, is a sleeve-8 that terminatesat its upper end in an outwardly "flaring ball race member 9 containing in an annular channel near its'outer end 'a series'of balls 10. The sleeve 8 below the ball race member 9 is of smaller diameter thana hole in a laminated lever 11 that is adapted to be turned around said sleeve as apivot, being supported by a collar 12 that is securedito said sleeveby screws 13. Thecollar is spaceda suflicient distance below the ball: race member 9, to form with ita flanged recess to receive said laminated lever 11, for the purpose of firmly iolding it while it is being freely turned in either direction for a purpose to be hereinafter described. (See Fig. 1.) I

As shown in Fig. l, the lever 11 is preferably made of two sections that have curved ends which, when spot welded together,form a socket 14 for the inner end of a handle 15. Being laminated as described, this lever may be easily constructed by the punch press, thus cheapening its manufacture.

Resting upon the balls 10 is a ratchet wheel 16 which is constructed as follows. Referring to Figs. 3 and 4t, this-ratchet wheel is made up of four laminations or sections that are spot welded together, thus making its construction also'a punch press job. The

upper and lower sections of the ratchet wheel v lower portions to provide between them an annular recess 17 for a purpose to be described.

In the upper end of the tubular standard 3 there are provided three segmental openings in each of which is fitted a flat key 18, preferably having straight sides, a convex outer end and a concave inner end. The inner ends of said keys project loosely into the annular recess or groove 17 in the ratchet wheel 6, to hold the latter on its bearings at all times without interfering with its free turning movement. The ball bearings 10 are thus prevented from falling out when the jack is turned upside down, or in any other position.

Secured by screws 20 to the top portion of the ratchet wheel 16, is a bell-shaped collar or sleeve 21 which is interiorly threaded to receive the screw 6. It is thus seen that since the collar 21 through which the screw passes, is secured to he ratchet wheel 16, said screw will also be prevented from dropping down when the jack is turned up-side down. Furthermore, since said screw is held from turning within the standard 3 by the pin 5, it may be readily elevated and lowered when the ratchet wheel 16 is turned by means now to be described.

Referring to Figs. 1, 5, 6 and 7 the ratchet wheel 16 is adapted to be turned by a double toothed pawl 22 of T shape. So that it may be readily constructed by the punch press, the pawl 22 is preferably constructed of three laminations, the top and bottomlaminations having the form 23 shown in Fig. 6 with a hole 2 1 provided in its inner end, through which passes a pivot pin 25 having a reduced lower end that is a drive fit in a hole contained in thelaminated lever 11. The middle section or lamination 26 of the pawl has a claw-shaped or recessed inner end that fits within an annular groove or channel 27 provided in the periphery of the pivot pin 25,

to hold the pawl 22 on the latter without interfering with its free movement about it.

For the purpose of holding the laminated pawl 22 in any position it might be given, the following device is provided. Referring to Figs. 1. and 5, a downwardly projecting pin 28 has a drive fit within a hole 29 in said pawl between its inner and outer ends. Positioned in a bore in said pin below its solid head portion, is a coil spring30 against the lower end of which there bears a ball 31 which travels a circumferential course on the upper surface of the laminated lever 11.

At the point where the right tooth oi the pawl 22 properly engages the ratchet wheel 16, the ball 31 is pressed by the spring 30 into a recess 32 in the top port-ion of the lever 11, while a similar recess receives said ball when the left tooth of the pawl 22 properly engages the ratchet wheel 16 to turn it in the opposite direction. By this ball and recess construction, the pawl 22 is held in an adjusted position so that the ratchet wheel 16 may be turned by it when force is applied to the handle 15 of the lever 11. The pawl may be readily withdrawn from engagement with the ratchetiwheel by the application of sufiicient force to move the ball 31 out of the recess 32. But slight eilort is required to do this; and when the pawl is out of engagement with the ratchet wheel, the latter may be easily turned quickly to elevate the screw 6 to the load, or lower it therefrom. It will thus be seen that my jack is a quick action one,in that the ratchet may be turned tree of the pawl, quickly to lift and lower the screw. The screw 6 carries the usual load receiving head 33. 7

As has been pointed out, the ratchet, pawl and other parts may be made by punch press operations and thereafter spot-welded together. This cheapens the construction of the jack considerably. Furthermore, through the means before described, the screw cannot drop down, nor the bearings fall out, when the jack is turned upside down, or held or placed in any other position.

Having described my invention, I claim:

1. In a device of the type described, the combination with a tubular standard, of a screw vertically movable therein, an antifriction bearing secured to the upper end of said standard, a horizontally disposed ratchet wheel resting upon said bearing, a threaded collar secured to said ratchet wheel, through which the screw projects, and keys fixed in the upper end of said standard, projecting into an annular groove provided in the inner portion of said ratchet wheel, whereby said screw and hearing are prevented from dropping from the standard when the latter is turned'up-side down.

2. In a device of the type described, the combination with a tubular standard, of a. screw vertically movable therein, an antifriction bearing secured to the upper end of said standard, a horizontally disposed ratchet wheel resting upon said bearing, a threaded collar secured to said ratchet wheel, through which the screw projects, said ratchet wheel being constructed of four laminations containing a central hole through which said standard projects, the hole in the two middle laminations being larger than that in the top and bottom ones, to provide an annular recess in said ratchet wheel, and keys projecting into said recess from the top portion of the standard, to prevent said screw and anttfriction bearing from dropping from the standard when the latter is turned up-side down.

3. In a device of the type described, the combination with a tubular standard, of a screw vertically movable therein, a sleeve secured to the upper end of said standard, terminating in an outwardly flaring ball race member, ball bearings contained therein, a horizontally disposed ratchet wheel resting upon said bearings, a threaded collar secured to said ratchet wheel, through which said screw projects, said ratchet wheel being constructed of four laminations containing a central hole through which said standard projects, the hole in the two middle laminations being larger than that in the top and bottom ones, to provide an annular recess in the ratchet wheel after said laminations are spot-welded together, and keys projecting into said annular recess in the ratchet wheel from the top portion of the standard, to prevent, said screw and anti-friction bearings from dropping from the standard when the latter is turned upside down.

4. In a device of the type described, the combination with a tubular standard, of a screw vertically movable therein, a horizontally disposed ratchet wheel on said stand-V ard, adapted to raise and lower said screw, a horizontally disposed lever pivotally secured to said standard, a pawl carried by said lever, adapted to engage and turn said ratchet, and a downwardly projecting spring-pressed member on said pawl, adapted to enter a recess in said lever, firmly to hold said pawl in any position it might be given.

5. In a device of the type described, the combination with a tubular standard, of a screw vertically movable therein, a horizontally disposed ratchet wheel on said standard, adapted to raise and lower said screw, a horizontally disposed lever pivotally secured to said standard, a pawl pivoted to the upper portion of said lever, adapted to engage and turn said ratchet, a downwardly projecting pin on said pawl, being hollow below its head, a spring in said hollow portion, and a ball fitted in the lower end of said pin, adapted to be pressed by said spring into a recess in the top portion of the lever, firmly to hold said pawl in any position it might be given.

6. In a device of the type described, the combination with a tubular standard, of a screw vertically movable therein, a horizontally disposed ratchet wheel on said standard, adapted to raise and lower said screw, a horizontally disposed lever pivotally secured to said standard, a pin pro ecting upwardly from said lever, having an annular groove therein, a pawl adapted to engage and turn said ratchet wheel, said pawl comprising two laminations each having a hole through which said pin projects, and a third lamination welded between the first two laminations, having a claw-shaped inner end adapted to'clutch in the annular groove in said pin, to hold the pawl thereon when the latter is moved by the lever.

in testimony whereof I have hereunto set my hand this 14th day of June, 1919.

l/Vitness W. W. FARBACH. 

